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With high content of the Al13 species and the active chloride, an electrochemically prepared polyaluminum chloride (E-PACl) presents integrated efficiency of coagulation and oxidation. The coagula- tion properties of E-PACl were systemically investi- gated through jar tests in the various water quality conditions. The active chlorine in E-PACl can signifi- cantly influence the coagulation behavior due to the active chlorine preoxidation, which can change the surface charge characteristic of organic matter (OM) in water. The active chlorine preoxidation could im- prove the E-PACl coagulation efficiency if the water possessed the characteristics of relatively low OM content (2 mg/L) and high hardness (278 mg CaCO3/L). In the water with medium content of OM (5 mg/L), dosage would be a crucial factor to decide whether the active chlorine in E-PACl aided coagula- tion process or not. Comparing with alkaline condition, active chlorine would show a more significant influ- ence on the coagulation process in acidic region.
With high content of the Al13 species and the active chloride, an electrochemically prepared polyaluminum chloride (E-PAC1) presents integrated efficiency of coagulation and oxidation. The coagula- tion properties of E-PACl were systemically investi- gated through jar tests in the various The active chlorine in E-PACl can signifi- cantly influence the coagulation behavior due to the active chlorine preoxidation, which can change the surface charge characteristic of organic matter (OM) in water. The active chlorine preoxidation could im- prove the E-PACl coagulation efficiency if the water possessed the characteristics of relatively low OM content (2 mg / L) and high hardness (278 mg CaCO3 / L) would be a crucial factor to decide whether the active chlorine in E-PACl aided coagulation process or not. Comparing with alkaline condition, active chlorine would show a more significant influnce on the coagulat ion process in acidic region.